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The Goodman B1392139 is a genuine OEM view-port bushing designed for the ACES800403AXAA furnace. This grommet seals the sight-glass opening on the burner/combustion compartment, letting a technician observe the flame while keeping the door panel sealed and maintaining the correct combustion-air envelope. A missing or brittle bushing allows air leakage that can disturb flame stability and pressure proving.
The OEM B1392139 is molded to the exact port diameter so it snaps in flush and seals without adhesive. Generic grommets often run loose or oversized, fall out during service, or fail to seal the opening. For such an inexpensive part, the genuine fit is worth it.
A 5-minute, tool-free swap. Cut power, pop the old bushing out of the panel, press the new one into the port until it seats, and reinstall the cover. No fasteners required. Verify the bushing sits flush so the compartment seals correctly.